Cobe-dbill



J. H. OKELL.

CORE DRILL.

APPLlcATloN FILED'SEPT. 8. |915.

l l 93,46@ Patented Aug. l, 1916.

.'.TAMES OKELLyOF LWS ANGELES, CALIFORNIA.

conn-mariti..

lApplication led September 19l5. Serialy No. 19,514,

To all whom it may concern: i

Be it knownv that l, JAMES H. 01mm., a citizen of the United States, residing at Los Angeles, in the county of Losv Angeles and State of California, have invented new and Auseful Improvements in Core-Drills, of

which lthe following is a specification.

My invention relates to that class of core drills which is used for obtaining cores out of the ground being drilled or examined, and the object thereof is to provide a drill f of simple and eifective 'construction which can be operated at aminimum cost, and

which is adapted for drilling through hard substances.

Heretofore drills have been used in which diamonds have been disposed in the cutting edges thereof, thereby making the drills costly. Sometimes when in operation, the drill would come to a-V crevice, and the 'diamonds loosened through thel continuous use would dropout and be lost, and their places must be refilled with other diamonds,

thereby making the operation exceedingly costly.v l v I am also aware that drills have been constructed in which vertical and annular slots v were formed in the lower or' drilling "end,

and the edges were chamfered, flared and drill, thereby making it expensive, due to the same.

the loss of time consumed in doing this.

In my,I improved tubular drill, I avoid these objections by nothaving any slot in the drill whatsoever, thereby not weakening Such construction enables the drill to retain both its strength and original circular design, which, l". find, is of great importance and value in formations that are naturally Vbroken and shattered and in which the loosened particles of the same constantly `coming in. contact with any slot during the rotation of the drill while in operation, have atendency to wedge said drill and increas the danger of twisting Volf the drill rods.

Specification of Letters atent.

Patented aug. i', raie;

- In core drills it is necessary to use a conv tinuous ilow of water for'the removalof theV y l l cuttings ordebris which are created during v drilling ot' ahole. A variable quantity and volume of water is required and I have found it advisable not to use any slot or openingr of any type at the bottom ofv such erin, as au Shot or abrasives used in drilling l must necessarily la upon the bottom of the hole to become e ective. In many conditions of `formations, it ispfound necessary A 'l to use large volumes of water which I'lind when passed through any slot 4or similar opening. in the bottom of the drillwashes and carries away the.' abrasive from the botj tom of the hole with the drillings-or deb ris,j, 'thereby' causing great waste of abrasive and i destroying the cuttingeciency. l

In .my improved vdrill l overcome these objections by using perforations which 'can be plugged, the object of which is that the i plugs can'be removed in'number sucient when desired, to allow a larger volume of r water to be used when foundvnecessary.

An embodiment of myjinventionis illustrated in the accompanying drawing, in l which: n

Figure l is a side elevation partly in section. Fig. 2 is a fragmentary elevation showing the positions of Athe perforations. gig. 3 is a section as seen' on the line 3-3of i '.3. i rhe drill head comprises la tubular'member i1 preferably having a dat lower end 5.

be closed with plugs 7. The plugsy 7 are oi? such characterthat they may be inserted in perforations 6 by means of a hammer and removed with the aid of a punch. The per' orations are preferably arranged inv substantially helical form, as will be particularly noted from Fig. 2. The upper end of the drill tube is internally threadedas indicated at 8 for engagement with the reducing` eo i Disposed in the. cylindrical wally of the tubu-f" lar member 4 are perforations 6 which may or driving head 9. A hollow drill rod 10 is secured by means of threads to the reducing head;

11 indicates the material from which the core is to be taken and l2'the core. Abrasive material indicated by13 `such as chilled shot v are vdisposed in the hole and about the lower end of the drill head.

RodA 10 is rotated causing rotation ofthe 110 drill tube and cutting of the material to be K cored.. VWater for cleaning out the drillings' n ,and debris enters the drill head through the .the debris giving the same an additional upward movement, thereby reducin friction upon the sides of thevdrill tube amI enabling the drill to give better cutting action. If the drill were rotated in a direction reverse to the helix the drillings and debrisA would be forced downward and packed aroundthe sides of the drill, preventing it from comin in contact with the abrasive material an thereby defeating the purpose for which i is used.

By the use of plugsin the perforations," vplugs may be removed at any point desired,

thereby enabling the operator to control the volume of water and keep the same from coming in contact with 'the bottom of the vbore and such abrasives as may be used at that point. y. A

Another advantage that is gained by this type of perforation is that the water in its exit through the perforations extending over `a/,la'rger axial length'of said drill has a better clearing action and removes the drillings with more eiiiciency, thereby re.

ducing the possibility of clogging and wedging. In formations that disintegrate rapidly under the action of water, a larger volume of debris overl that of actualv drillings must be removed and this requires an increased volume ofwater. The number andposition of plugs removed are selected with reference to the particular: formationV of the material drilled.

xWhat I claim is: l. The combination of atubular drill,

.comprising a barrel provided in its cylindrical wall with perforations adapted to be plugged, said perforations distributed over,V

the cylindrical surface of said barrel for the outflow of. water, and loose abrasives disposed at the cutting edge of said drill.

'2. The combination of a tubular drill,

comprising a barrel provided in its cylindrical wall with perforations adapted lto be plugged, said perforations disposed' over the length of the barrel in helical form, and loose abrasives disposed at the cutting edge of-said drill. v

In witness that I claim the foregoing I have hereunto subscribed my name this 26th day of August, 1915.

, JAMES H. OKELL. 

